Intraocular lens insertion device and cartridge

ABSTRACT

An intraocular lens insertion device and a cartridge which enable the intraocular lens to be inserted into an eye more stably and easily than ever before. A supporting portion 102 of an intraocular lens 100 arranged on a lens-advancing side in a lens-advancing direction x is pressed against a protrusion 21 so as to be bent backward. Thus, releasing the intraocular lens 100 from a nozzle portion 13 is allowed to begin with the releasing of a curved portion of the supporting portion 102 that has become U-shaped and hard to move freely. As a result, there can be provided an intraocular lens insertion device and a cartridge which enable the intraocular lens 100 to be inserted into an eye more steadily and easily than ever before.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.12/995,263, now U.S. Pat. No. 9,554,894, which has a 35 U.S.C. § 371(c)date of Dec. 15, 2010 and is a U.S. national phase application under 35U.S.C. § 371 of International Patent Application No. PCT/JP2009/060184,filed Jun. 3, 2009, which claims priority to Japanese patent applicationNo. 2008-147781, filed Jun. 5, 2008. The content of each application isincorporated herein in its entirety.

TECHNICAL FIELD

This invention relates to an intraocular lens insertion device and acartridge thereof that are used when implanting an intraocular lens intoan aphakic eye after a cataract operation.

BACKGROUND ART

In a cataract operation, removing an opacified lens byphacoemulsification (PEA), and implanting an intraocular lens afterremoving an opacified lens are widely performed. Intraocular lensesinclude: a hard intraocular lens whose optical portion is made of a hardmaterial such as PMMA (polymethylmethacrylate), and a soft intraocularlens which is made of a soft material such as silicone elastomer, softacrylic, or hydrogel.

When using a hard intraocular lens, the intraocular lens must beinserted through an incision formed in the cornea or sclera that is ofthe same or slightly wider width than the diameter of the opticalportion. On the other hand, when using a soft intraocular lens, foldingof the optical portion allows the intraocular lens to be inserted intothe eye through an incision smaller than the diameter of the opticalportion.

FIGS. 12(A) and 12(B) show a soft intraocular lens of this kind. A frontview is shown in FIG. 12(A) and a side view is shown in FIG. 12(B). Inpractice, a soft intraocular lens 100 of this kind is formed in a flatcircular shape and comprises an optical portion 101 serving as acrystalline lens in an eyeball and two supporting portions 102, 102formed in a linear shape. These two supporting portions 102, 102 areprovided at two symmetrically opposite sections on the circumference ofthe optical portion 101. The supporting portions 102, 102 are extendedin the form of a circular arc in such a manner as gradually departingaway from the outer fringe of the optical portion 101 at a curvatureslightly larger than that of the outer fringe of the optical portion101.

The soft intraocular lens 100 of this kind is designed so as to be ableto be inserted through a small incision into an eye after the opticalportion 101 thereof is folded in two by an intraocular lens insertiondevice disclosed, for example, in Intl Application Publication Pamphletof WO2006/090531 or Japanese Unexamined Patent Application PublicationNo. 2004-351196.

-   Patent Document 1: WO2006/090531 Intl Application Publication    Pamphlet-   Patent Document 2: Japanese Unexamined Patent Application    Publication No. 2004-351196

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

According to these conventional intraocular insertion devices, however,there is a problem that proficiency is required to insert theintraocular lens 100 into the eye while keeping the distal end of thesupporting portion 102 stable because when inserting the intraocularlens 100 into a lens capsule C inside an eyeball E, the distal end ofthe supporting portion 102 is foremost discharged from a discharge port104, as shown in FIG. 13, and thus the distal end of the supportingportion 102 is prone to be moved freely.

In view of the problem described above, it is, therefore, an object ofthe present invention to provide an intraocular lens insertion deviceand cartridge thereof which enable an intraocular lens to be insertedinto an eye more easily and more stably as compared to by theconventional ones.

Means for Solving the Problem

In order to achieve the object of the present invention, the presentinvention according to a first aspect is characterized by an intraocularlens insertion device comprising:

an cylindrical insertion portion to place therein an intraocular lenshaving one or more supporting portions provided on an outer fringe of anoptical portion thereof, said intraocular lens insertion device pushingout said intraocular lens by a plunger, and then releasing saidintraocular lens to an outside from a nozzle portion of said cylindricalinsertion portion,

wherein said supporting portion arranged on an advancing side withrespect to a lens-advancing direction is bent backward by a bendingmeans in said cylindrical insertion portion.

The present invention according to a second aspect is characterized inthat said bending means is a protrusion while said supporting portion ispressed against said protrusion to be bent backward.

The present invention according to a third aspect is characterized inthat said protrusion is detachably provided in said cylindricalinsertion portion.

The present invention according to a fourth aspect is characterized inthat said protrusion is provided in a separate casing while said casingis detachably attached to said cylindrical insertion portion.

The present invention according to a fifth aspect is characterized inthat said plunger is provided in a main body of the insertion device,while said cylindrical insertion portion is a cartridge attached to saidmain body of the insertion device,

wherein said cartridge is separated from said casing and attached tosaid main body of the insertion device after said supporting portion ofthe intraocular lens placed on a lens placement portion is bent by saidprotrusion.

The present invention according to a sixth aspect is characterized inthat said intraocular lens is of a preset type with said intraocularlens set in advance.

The present invention according to a seventh aspect is characterized bya cartridge attached to a main body of an insertion device provided witha plunger for pushing out an intraocular lens having one or moresupporting portions provided on an outer fringe of an optical portionthereof, comprising:

a lens placement portion to place therein said intraocular lens from alens insertion opening;

a nozzle portion communicating with said lens placement portion torelease said intraocular lens to an outside,

wherein said supporting portion arranged on an advancing side withrespect to a lens-advancing direction is bent backward by a bendingmeans in said lens placement portion.

The present invention according to an eighth aspect is characterized inthat said bending means is a protrusion while said supporting portion ispressed against said protrusion to be bent backward.

The present invention according to a ninth aspect is characterized inthat said protrusion is detachably provided in said lens placementportion.

The present invention according to a tenth aspect is characterized inthat said protrusion is provided in a separate casing while said casingis detachably attached to said lens placement portion.

The present invention according to an eleventh aspect is characterizedin that said cartridge is separated from said casing and attached tosaid main body of the insertion device after said supporting portion ofthe intraocular lens placed on said lens placement portion is bent bysaid protrusion.

Effects of the Invention

In accordance with the intraocular lens insertion device according tothe first aspect and the cartridge according to the seventh aspect, thesupporting portion of the intraocular lens placed on the lens advancingside is bent backward by the bending means, thus enabling theintraocular lens to be released after it is folded and made less likelyto move freely when it is released from the nozzle. Thus, theintraocular lens can be more easily inserted into an eye with the samekept in a more stable condition than by the conventional ones.

In accordance with the intraocular lens insertion device according tothe third aspect and the cartridge according to the ninth aspect, it ispossible to prevent the protrusion from blocking the movement wheninserting the intraocular lens into an eye.

In accordance with the intraocular lens insertion device according tothe fourth aspect and the cartridge according to the tenth aspect, theprotrusion is provided in the casing, and thus even thin and shortprotrusion can be easily engaged or disengaged by just attaching ordetaching the casing to or from the cartridge.

In accordance with the intraocular lens insertion device according tothe sixth aspect, in a preset type in which a lens is set in advance,the intraocular lens can be released after it is folded and made lesslikely to move freely when it is released from the nozzle. Thus, theintraocular lens can be more easily inserted into an eye with the samekept in a more stable condition than by the conventional ones.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing the whole structure of anintraocular lens insertion device according to a first embodiment of theinvention.

FIGS. 2(A) and 2(B) are front and end views of a cartridge.

FIG. 3 is an exploded perspective view showing the whole structure ofthe cartridge and a casing.

FIG. 4 is a perspective view showing the cartridge being placed onto thecasing.

FIGS. 5(A), 5(B) and 5(C) are front, side and end views of the casing.

FIGS. 6(A), 6(B) and 6(C) are cross-sectional views of the cartridgeused for explanation of how the intraocular lens is installed in thecartridge placed onto the casing.

FIGS. 7(A), 7(B), 7(C) and 7 (D) are cross-sectional views of thecartridge used for explanation of how the intraocular lens is installedin the cartridge according to a second embodiment.

FIG. 8 is a perspective view showing the whole structure of theintraocular lens insertion device with the casing according to a thirdembodiment.

FIG. 9 is a perspective view showing the structure of the intraocularlens insertion device according to the third embodiment.

FIG. 10 is an exploded perspective view showing the structures of thecasing and a cover body.

FIG. 11 is a perspective view showing the intraocular lens insertiondevice placed onto the casing according to the third embodiment.

FIGS. 12(A) and 12(B) are front and side views of the intraocular lens.

FIG. 13 is a front view illustrating how the intraocular lens isinserted into the eye using the intraocular lens insertion device.

BEST MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments of the present invention are described hereinafterwith reference to the drawings.

First Embodiment

(1) Basic Structure of Intraocular Lens Insertion Device

In FIG. 1, reference numeral 1 indicates an intraocular lens insertiondevice as a whole. The intraocular lens insertion device 1 comprises acartridge 2 and an insertion device body 3 having a plunger 4. Thecartridge 2 is attached to an attaching portion 3 a of the insertiondevice body 3. Further, the intraocular lens insertion device 1 has anintraocular lens 100 installed in the cartridge 2, and is structured soas to be able to discharge the intraocular lens 100 from the tip end ofthe cartridge 2 into an eye by pushing out the intraocular lens 100 inthe lens-advancing direction x (i.e., the direction of an arrow x, or ananterior direction in the lens-advancing axis A) using the plunger 4.

(2) Structure of Cartridge

The cartridge 2 attached to the insertion device body 3 as referred toabove is described further below. As shown in FIG. 2(A), the cartridge2, serving as a cylindrical or tubular insertion portion, comprises acartridge body 14 composed of a lens insertion opening 10, a lensplacement portion 11, a transition portion 12 and a nozzle 13 insequence, along the lens-advancing axis A; and wings 15, 15 extendingfrom both side faces of the cartridge body 14 along the lateraldirection y perpendicular to the lens-advancing direction x.

The lens insertion opening 10 is provided with an insertion groove 16formed on upper and lower surfaces by being cut out in thelens-advancing direction x. The lens placement portion 11 is providedanterior to the lens insertion opening 10 with respect to thelens-advancing axis A, and the transition portion 12 is providedanterior to the lens placement portion 11 with respect to thelens-advancing axis A. An inner wall of the transition portion 12 isformed in the shape of a mortar gradually tapering toward the tip endthereof, and the tip end of the transition portion 12 is communicatedwith the nozzle 13.

In this way, the cartridge body 14 is formed such that the intraocularlens 100 can be moved from the lens placement portion 11 through thetransition portion 12 to the nozzle 13 in sequence by being pushed withthe plunger 4 in the lens-advancing direction x. Also, the cartridgebody 14 is formed so as to be able to discharge the intraocular lenspushed by the plunger 4 into the eye from a discharge port 13 a of thenozzle 13. Here, the nozzle 13 is contoured so that it can be insertedinto an incision (not shown).

In addition to the above-mentioned basic structure, the cartridge 2 ofthe present invention is provided with a protrusion insertion hole 20formed so as to penetrate the thickness thereof in the vicinity of thelens placement portion 11 toward the vertical direction z perpendicularto both the lens-advancing direction x and the lateral direction y, asillustrated in FIGS. 2(A) and 2(B). In the case of the presentembodiment, the protrusion insertion hole 20 is, as shown in FIG. 2(A),shifted toward one side relative to the lens-advancing axis A (in thiscase, downward) and is formed so as to allow a hole region thereof tocross only a part of a transition space in which the intraocular lens100 moves.

Furthermore, the cartridge 2 is formed so as to be detachable from acasing 22 on which a protrusion 21 is vertically provided so that theprotrusion 21 may be inserted into the protrusion insertion hole 20 byattaching the cartridge 2 to the casing. When the cartridge 2 isattached to the casing 22 and thus the protrusion 21 is inserted intothe protrusion insertion hole 20, the protrusion 21 is allowed to passthrough a part of the transition space in the cartridge 2 so that thetip end of the protrusion 21 is exposed to the outside.

Here, as shown in FIGS. 5(A), 5(B) and 5(C), the casing 22 includes acasing main body 23 to which the cartridge 2 is attached, and the casingmain body 23 is provided with fixing claws 24, 24 for fixedly attachingthe cartridge 2 to the casing main body 23 and the said protrusion 21that is to be inserted into the protrusion insertion hole 20 at the timeof the attachment of the cartridge 2.

The casing main body 23 is integrally formed of a synthetic resinmaterial such as a plastic material, and comprises a tip-side holdingportion 25 holding the transition portion 12 and nozzle 13 of thecartridge 2; and an insertion-side holding portion 26 holding the lensinsertion opening 10, lens placement portion 11 and wings 15, 15 of thecartridge 2.

According to the present embodiment, the tip-side holding portion 25includes a base plate 27 having a bell shape as a whole such that itsside faces are slightly concavely curved toward the inside at theircentral portions, and a wall portion 28 vertically provided along theouter fringe of the base plate 27. Thus, the tip-side holding portion 25is formed such that the side faces of the wall portion 28 are alsoslightly concavely curved toward the inside at their central portions,corresponding to the contour of the base plate 27, so that it may beeasily held between user's thumb and index finger.

The tip-side holding portion 25 includes a cutout portion 30 provided ata wall portion 29 on a proximal portion thereof adjacent to theinsertion-side holding portion 26. The cutout portion 30 is formed bybeing cut out in a concavely curved manner, corresponding to the contourof the transition portion 12 of the cartridge 2, thereby enabling thetransition portion 12 of the cartridge 2 to be placed on the cutoutportion 30.

Further, the tip-side holding portion 25 includes an inner wall portion31 spaced a distance away from the wall portion 29 on the proximalportion, extending toward the lateral direction y. The inner wallportion 31 is cut out in a concavely curved manner, corresponding to thecontour of the transition portion 12 of the cartridge 2, therebyenabling the transition portion 12 of the cartridge 2 to be placed on acutout portion 32 thereof as well.

Furthermore, the tip-side holding portion 25 includes the two fixingclaws 24, 24 opposed to each other, at given positions on the base plate27 between the wall portion 29 on the proximal side and the inner wallportion 31. Here, the two fixing claws 24, 24 have elastic retentioncapacity as a result of selecting a synthetic resin material as amaterial, thereby expanding the fixing claws 24, 24 toward the lateraldirection y by an external force applied at the time when the cartridge2 is placed on the casing 22 and returning the fixing claws 24, 24 to anoriginal state at the time when the external force is no longer applied.

The fixing claws 24, 24 are each provided, at their tip end, with anengaging claw 24 a folded back toward the upper face side of thecartridge 2, so that the cartridge 2 may be fitted and held in thecasing 22 through the two fixing claws 24, 24 of the tip-side holdingportion 25.

On the other hand, the insertion-side holding portion 26 comprises abase plate 35 formed by cutting a rectangular plate in a letter U shape,and a wall portion 36 vertically provided at both side faces of the baseplate 35. The insertion-side holding portion 26 is configured to holdthe cartridge 2 due to the wings 15 of the cartridge 2 abutting onto theupper faces of the wall portions 36 when the cartridge 2 is fitted inthe fixing claws 24 of the tip-side holding portion 25 (See FIG. 4).

In addition to the above-mentioned structure, the casing 22 of thepresent invention is provided with the protrusion 21 verticallyextending from the base plate 35 of the insertion-side holding portion26. The protrusion 21 is formed so that it may be able to be insertedinto the protrusion insertion hole 20 of the cartridge 2 when thecartridge 2 is installed in the casing 22 through the fixing claws 24,24 of the tip-side holding portion 25.

In practice, the protrusion 21, serving as a folding means, isstrip-shaped and formed to have a given thickness, corresponding to theshape of the opening of the protrusion insertion hole 20 of thecartridge 2, and is vertically provided on the base plate 35 of theinsertion-side holding portion 26 so as to be extended in the verticaldirection z. With the cartridge 2 being installed on such casing 22, theintraocular lens 100 can be inserted from the lens insertion opening 10of the cartridge 2.

Then, as shown in FIG. 6(A), the optical portion 101 of the intraocularlens 100 is folded in two with supporting portions 102, 102 extendedoutward. With that posture, the optical portion 101 is grasped withtweezers (not shown), and then, as shown in FIG. 6(B), the intraocularlens is inserted into the lens insertion opening 10 while it is arrangedso as to allow the tip end of one of the supporting portions 102 to abutonto the protrusion 21. Here, for sake of simplicity, the casing mainbody 23 is not shown but only the protrusion 21 is shown in FIGS. 6(A)to 6(C).

Then, the cartridge 2 allows the distal end of the supporting portion102 of the intraocular lens 100 to abut onto the protrusion 21 that isexposed within the transition space 39. With the tip actually beingabutted onto the protrusion 21, the intraocular lens 100 is inserted upto the lens placement portion 11 by the tweezers. In this way, as shownin FIG. 6(C), the cartridge 2 allows the distal end of the supportingportion 102 to be folded back by the protrusion 21 in the oppositedirection against the lens-advancing direction x (hereinafter, this iscalled backward direction).

Thus, the cartridge 2 is able to place the intraocular lens 100 on thelens placement portion 11 with the supporting portion 102 being foldedin a substantially U-shape by the protrusion 21.

Moreover, the cartridge 2 is formed such that the optical portion 101 ofthe intraocular lens 100 abuts on the protrusion 21 that is insertedthrough the protrusion insertion hole 20 and is exposed to thetransition space 39, so that the protrusion 21 receives the opticalportion 101, thereby precisely positioning the intraocular lens 100 onthe lens placement portion 11.

After that, the cartridge 2 is removed from the casing 22 and thus theprotrusion 21 is allowed to disengage from the protrusion insertion hole20. However, the cartridge 2 can keep the distal end of the supportingportion 102 folded back toward the optical portion 101 by allowing thesupporting portion 10 of the intraocular lens 100, which had beenabutted onto the protrusion 21 until then, to abut onto an inner wall 40of the transition space 39. In such state, the cartridge 2 is capable ofbeing attached to the attaching portion 3 a of the insertion device body3. Thus, the intraocular lens insertion device 1 allows the intraocularlens 100 to be pushed out by the plunger 4 toward the lens-advancingdirection x with the supporting portion 102 being folded back, thusenabling the intraocular lens 100 to be released into an eye from thenozzle 13 provided on the tip end of the cartridge 2.

At this time, the intraocular lens insertion device 1 of the presentinvention allows the curved portion of the folded supporting portion102, which has become U-shaped and less likely to move freely, to beexposed from the discharge port 13 a of the nozzle 13, and then allowsthe optical portion 101 to be released from the discharge port 13 athereof by pushing out the intraocular lens 100 by the plunger 4,thereby preventing only the distal end of the supporting portion 102from being released and moved freely in the process of releasing theintraocular lens 100 into the eye from the tip end of the cartridge 2.

3. Behavior and Effects

According to the above-mentioned structure, the cartridge 2 is installedin the casing 22, thereby allowing the protrusion 21 provided on thecasing 22 to be inserted into the protrusion insertion hole 20 so thatthe protrusion 21 can be exposed to the transition space 39.

A user may insert the intraocular lens 100 from the lens insertionopening 10 with the cartridge 2 being installed in the casing 22, andplace the intraocular lens 100 on the lens placement portion 11. At thistime, the user can pinch the wall portion 28 of the casing 22 muchlarger in size than the wings 15, 15 without directly pinching the wings15, 15 of the cartridge 2, thereby enabling the cartridge 2 to be easilystabilized. Thus, the user can place the intraocular lens 100 on thelens placement portion 11 more easily than by the conventional ones.

Further, the user can hold the cartridge 2 in a stable condition bypinching the wall portion 28 of the casing 22, thus enabling the user toeasily fill a viscoelastic material such as a hyaluronic acidpreparation for ophthalmic application into the inside of the cartridge2.

Furthermore, according to the cartridge 2, when the intraocular lens 100is gradually inserted from the lens insertion opening 10 in order toplace the intraocular lens 100 on the lens placement portion 11, thedistal end of the supporting portion 102 of the intraocular lens 100 isallowed to abut on the protrusion 21, and thus the distal end of thesupporting portion 102 in the lens-advancing direction x can be foldedbackward.

Particularly, according to the present embodiment, since the protrusion21 is not exposed all through the transition space 39, but is onlyexposed in a part thereof at one side in the lens-advancing axis A, itis possible to allow only the distal end of the supporting portion 102to abut on the protrusion 21, thereby ensuring an intermediate portionbetween the distal end of the supporting portion 102 and the proximalportion thereof to be folded in a U-shape.

According to the intraocular lens insertion device 1, therefore, thesupporting portion 102 of the intraocular lens placed on the lensadvancing side with respect to the lens-advancing direction x is pressedagainst the protrusion 21 to thereby be folded backward, thus enablingthe curved portion of the folded supporting portion 102, which hasbecome U-shaped and less likely to move freely, to be first releasedwhen releasing the intraocular lens 100 from the nozzle 13. Thus, theintraocular lens 100 can be more easily inserted into an eye with thesame kept in a more stable condition than by the conventional ones.

Moreover, the intraocular lens insertion device 1 is detachably providedwith the protrusion 21, thereby preventing the protrusion 21 fromblocking the movement of the intraocular lens 100 when inserting theintraocular lens 100 into an eye.

Additionally, according to the present embodiment, the protrusioninsertion hole 20 of the cartridge 2 is drilled at the top face of thelens placement portion 11 so that the tip of the protrusion 21 of thecasing 22 is exposed from the top face of the lens placement portion 11,and thus a user can visually confirm the position of the protrusion 21in a moment. Accordingly, it is possible to ensure the distal end of thesupporting portion 102 to be properly placed on the side of theprotrusion 21 so that the supporting portion 102 may be pressed to theprotrusion 21 and folded when the intraocular lens 100 is placed on thelens placement portion 11.

Also, according to the present embodiment, the protrusion 21 is providedon the casing 22, and thus even thin and short protrusion 21 can beinserted into and removed from the protrusion insertion hole 20 of thecartridge 2 by just attaching and detaching the casing 22 to and fromthe cartridge 2.

Besides, the cartridge 2 is installed in the casing 22, and thus thenozzle 13, the transition portion 12 and the like can be protectedagainst an external force owing to the casing 22. In addition, thecartridge 2 can be placed on a pedestal with the casing 22 installed,thus preventing the nozzle 13, the transition portion 12 and the likefrom directly contacting the pedestal. Accordingly, the cartridge 2 canbe always kept clean.

Second Embodiment

FIGS. 7(A) to 7(D), which are given the same reference numerals ascorresponding parts in FIGS. 6(A) to 6(C), shows a cartridge accordingto a second embodiment. A cartridge 50 is different from that of theforegoing first embodiment in that the optical portion 101 is insertedinto a lens insertion opening 51 without being folded in half.

In practice, as shown in FIGS. 7(A) and 7(B), the cartridge 50 is formedso as to be able to be installed in the casing not shown in thedrawings. When it is installed in the casing, a protrusion 52 providedon the casing is allowed to be inserted into a protrusion insertion hole53. In the meantime, for sake of simplicity, the casing is not shown inFIGS. 7(A) to 7(D) but only the protrusion 52 is shown therein.

In practice, the protrusion insertion hole 53 is drilled so as topenetrate the thickness in the vicinity of the lens placement portion 54toward the bottom-to-top direction (toward a viewer seeing the drawing)perpendicular to both the lens-advancing direction x and the lateraldirection y. In this embodiment, the protrusion insertion hole 20 isdrilled in the substantial center of the lens placement portion 54 so asto cross the lens-advancing axis A, and thus an hole region is formed inthe middle of the transition space in which the intraocular lens 100moves.

Thus, when the protrusion 52 is inserted into protrusion insertion hole53 by installing the cartridge 50 in the casing, the protrusion 52passes through the middle of the transition space 39 and the tip of theprotrusion 52 can be exposed to the outside.

In that state, the intraocular lens 100 is pinched with a tweezers (notshown) with the supporting portions 102, 102 extending outwardly and theoptical portion 101 unfolded, and then it may be inserted into the lensinsertion opening 51 of the cartridge 50, with the tip of one supportingportion 102 being the leading end, as illustrated in FIG. 7(C).

At this time, the cartridge 50 allows the distal end of the supportingportion 102 of the intraocular lens 100 to abut on the protrusion 21exposed inside the transition space 39. In that state, the intraocularlens 100 is inserted up to the lens placement portion 54 by thetweezers. In this way, as shown in FIG. 7(D), the cartridge 50 allowsthe distal end of the supporting portion 102 to be folded back along acurved surface of the protrusion 52 in the opposite direction relativeto the lens-advancing direction x. Thus, the cartridge 50 enables theintraocular lens 100 to be placed on the lens placement portion 54 withthe supporting portion 102 being folded in a U-shape by the protrusion52.

In this embodiment, the surface of the protrusion 52 on which thesupporting portion 102 of the intraocular lens 100 abuts is curvedtoward a given direction, thereby ensuring the supporting portion 102 ofthe intraocular lens 100 to be bent in a desired direction along thecurved surface.

After that, like in the above-mentioned first embodiment, the cartridge50 is removed from the casing and thus the protrusion 52 disengages fromthe protrusion insertion hole 53. The cartridge 50, however, is capableof keeping the distal end of the supporting portion 102 folded due tothe supporting portion 102 of the intraocular lens 100, which had beenabutted on the protrusion 52 until then, to then abut onto the innerwall 40 in the transition space 39. In such state, the cartridge 50 iscapable of being attached to the attaching portion of the insertiondevice body not shown. Thus, the intraocular lens insertion deviceallows the intraocular lens 100 to be pushed out by the plunger 4 in thelens-advancing direction x with the supporting portion 102 being foldedback, thus enabling the intraocular lens 100 to be released into an eyefrom the nozzle 13 provided on the tip end of the cartridge 2.

Third Embodiment

In FIG. 8, numeral 60 denotes an assembly of an intraocular lensinsertion device and a casing according to a third embodiment. Theassembly 60 of an intraocular lens insertion device and a casingcomprises an intraocular lens insertion device 61, a casing 62 on whichthe intraocular lens insertion device 61 is detachably installed, and acover body 63 which is detachably attached to the casing 62 on which theintraocular lens insertion device 61 is installed to cover theintraocular lens insertion device 61.

At first, the intraocular lens insertion device 61 is describedhereinbelow. The intraocular lens insertion device 61 is of apreset-type in which the intraocular lens 100 is set in advance, unlikein the foregoing first and second embodiments.

As shown in FIG. 9, the intraocular lens insertion device 61 comprises amain body 66, a slider 67, a plunger 68 and a locking mechanism, andthis main body 66 comprises a cylindrical proximal member 70 and atapered distal member 71.

In this case, a lens placement portion (not shown) made of a platemember is provided in the distal portion of the proximal member 70 onthe lens advancing side with respect to the lens-advancing axis A sothat the intraocular lens 100 may be placed on the lens placementportion. Further, the tapered distal member 71 is connected integrallywith the proximal member 70 so that the intraocular lens 100 placed onthe lens placement portion of the proximal member 70 may be placed inthe inside of the tapered distal member 71.

The slider 67 and the plunger 68 are provided so as to be movableback-and-forth in the main body 66. The locking mechanism 69 can limitthe forward movement of the plunger 68. The locking mechanism 69 isunlocked by moving the slider 67 forward, thereby allowing the plunger68 to be movable forward.

The intraocular lens insertion device 61 thus structured allows theintraocular lens 100 to be pushed by the slider 67 so that it isproperly folded in a predetermined shape at first, and then allows theintraocular lens 100 to be inserted into an eye by folding theintraocular lens 100 even smaller by continuously pushing theintraocular lens 100 by the plunger 68. Accordingly, the intraocularlens insertion device 61 is structured such that the locking mechanism69 thereof ensures that the intraocular lens 100 is prevented from beingpushed out by the plunger 68 prior to being pushed out by the slider 67,and thus the intraocular lens 100 placed in the main body 66 is foldedas it is moved forward in two steps by the slider 67 and then by theplunger.

These matters have already been disclosed by the present applicant. Fordetails relating to the matters, one may refer to the description inBest Mode for Carrying Out the Invention in PCT/JP2008/59995, forexample.

In this case, the cylindrical insertion portion according to claim 1comprises the lens placement portion and the tapered distal member 71,and in the tapered distal member 71, a protrusion insertion hole 73 isdrilled so as to penetrate the thickness of the tapered distal member 71toward the vertical direction z perpendicular to both the lens-advancingdirection x and the lateral direction y. According to this embodiment,the protrusion insertion hole 73 is drilled in the approximate center ofthe lens placement portion 54 so as to cross the lens-advancing axis A,and a hole region is formed in the middle of the transition space inwhich the intraocular lens 100 moves.

The intraocular lens insertion device 61 is capable of being removablyattached to the casing 62 which is separate from the intraocular lensinsertion device 61 and is formed from e.g., a synthetic resin materialinto a one-piece structure. As shown in FIG. 10, a U-shaped wall portion76 is vertically provided on a base plate 75 of the casing 63, in amanner surrounding the intraocular lens insertion device 61, while aprotrusion 80 is vertically provided on a given position of the baseplate 75.

The protrusion 80 has the same structure as that of the foregoing secondembodiment so that it may be, as shown in FIG. 11, inserted into theprotrusion insertion hole 73 of the intraocular lens insertion device 61by installing the intraocular lens insertion device 61 in the casing 62.In this way, in the intraocular lens insertion device 61, the protrusion80 of the casing 62 can be arranged in the center region of thetransition space of the tapered distal member 71.

Also, as shown in FIG. 10, the wall portion 76 of the casing 62 isformed, on its both sides, with a stepped portion 81 whose height fromthe base plate 75 is comparatively low. As shown in FIG. 11, when theintraocular lens insertion device 61 is installed, the slider 67 of theintraocular lens insertion device 61 is capable of being located on thestepped portion 81.

At this time, there is a given distance between an abutting surface 82of the wall portion 76 and the slider 67 of the intraocular lensinsertion device 61.

Thus, the intraocular lens insertion device 61 can move the intraocularlens 100 installed inside the tapered distal member 71 toward thelens-advancing direction x up to a given position, by allowing theslider 67 in the lens-advancing direction x until it abuts on theabutting surface 82 of the wall portion 76 of the casing 62.

In this way, like in the foregoing second embodiment, the intraocularlens 100 is allowed to have its supporting portion 102 abutted on theprotrusion 80 so as to have the tip end of the supporting portion 102folded back along a curved surface of the protrusion 80 in the backwarddirection opposed to the lens-advancing direction x. Thus, theintraocular lens insertion device 61 is capable of placing theintraocular lens 100 on the lens placement portion (not shown) with thesupporting portion 102 folded in a substantially U-shape by theprotrusion 80.

Also, the intraocular lens insertion device 61 is detached from thecasing 62 with the above arrangement being retained, and then theintraocular lens 100 is pushed out by the plunger 68 in thelens-advancing direction x with the supporting portion 102 folded back,thereby allowing the intraocular lens 100 to be released from a nozzle85 of the tapered distal member 71.

In the meantime, as shown in FIG. 10, fitting holes 86 are drilled onthe top surface of the wall portion 76 of the casing 62 so that fittingprotrusions 87 provided on the lower surface of the cover body 63 may befitted into the fitting holes 86, thereby allowing the cover body 63 tobe attached to the casing 62.

In practice, the contour of the lower surface of the cover body 63 isformed corresponding to that of the top surface of the wall portion 76of the casing 62, and thus it includes a stepped abutting portion 88formed corresponding to the shape of the stepped portion 81 of the wallportion 76.

Accordingly, as shown in FIG. 8, when the cover body 63 is attached tothe casing 62 on which the intraocular lens insertion device 61 isinstalled, the stepped abutting portion 88 is fitted in a gap formedbetween the abutting surface 82 of the wall portion 76 of the casing 62and the slider 67 of the intraocular lens insertion device 61, therebypreventing the slider 67 from sliding.

Additionally, as shown in FIG. 10, the cover body 63 may have, forexample, two positioning protrusions 90, 91 on the lower surface thereofso that the positioning protrusions 90, 91 may be inserted intopositioning holes 92, 93 drilled in the tapered distal member 71 of theintraocular lens insertion device 61 (see FIG. 9). Accordingly, when thecover body 63 is attached to the casing 62, the positioning protrusions90, 91 of the cover body 63 are inserted into these positioning holes92, 93 respectively, thereby allowing the two supporting portions 102,102 of the intraocular lens 100 to be properly positioned by allowingthem to abut on the positioning protrusions 90, 91. Here, it is to benoted that the intraocular lens insertion device 61 allows aviscoelastic material such as a hyaluronic acid preparation forophthalmic application to be filled thereinside through one positioninghole 91 by a syringe or the like not shown in the drawings.

From the above-mentioned structure, the intraocular lens insertiondevice 61 enables the supporting portion 102 of the intraocular lens 100arranged on the lens-advancing side with respect to the lens-advancingdirection x to be bent by the protrusion 80 in the backward direction,thus enabling the curved portion of the supporting portion 102, whichhas become U-shaped and hardly movable, to be released first whenreleasing the intraocular lens 100 from the tapered distal member 71,thereby enabling the intraocular lens 100 to be inserted into an eyemore easily and stably compared to by the conventional ones.

Other Embodiments

The present invention is not limited to the foregoing embodiments andvarious modifications are possible within the scope of the gist of thepresent invention. For example, the protrusion may be formed in acircular or various other shapes. Further, the present invention is alsoapplicable to other intraocular lens which has only one supportingportion, or three, four or more supporting portions provided on theoptical portion.

Whilst the supporting portion 102 is folded in a U-shape by theprotrusions 21, 52, 80 in the foregoing embodiments, the presentinvention is not limited thereto, but the supporting portion 102 may befolded in V-, C-, L- or various other shapes by the protrusions 21, 52,80.

Moreover, whilst the protrusions 21, 52, 80 extending in the verticaldirection z are proposed in the foregoing embodiments, the presentinvention is not limited thereto. Any other protrusions extending in thelateral direction y, oblique direction, or various other directions maybe possible, as long as the distal end of the supporting portion 102 ofthe intraocular lens 100 can be folded in the backward direction whichis opposed to the lens-advancing direction x. In these cases, aprotrusion insertion hole may be drilled in the cartridge 2, 50 and thetapered distal member 71, corresponding to the extending direction ofthe protrusion.

Additionally, whilst the protrusions 21, 80 are provided on the casings22, 62 respectively in the foregoing embodiments, the present inventionis not limited thereto, but various other configurations are applicable,such that only the protrusion may be detachably provided, or theprotrusion may be provided on the cartridge or tapered distal memberitself, and then moved by a slide mechanism.

In addition, whilst the protrusion insertion hole 20 is provided in thevicinity of the lens placement portion 11 in the foregoing embodiments,the present invention is not limited to this. The protrusion 21 may beprovided on the lens insertion opening 10, transition portion 12, orvarious other portions, as long as the tip end of the supporting portion102 of the intraocular lens 100 can be folded in the backward directionas opposed to the lens-advancing direction x when the intraocular lensis released from the nozzle 13.

In addition to the foregoing, whilst the protrusion insertion hole 20 isdrilled through between the top surface and the lower surface of thelens placement portion 11 and the tip of the protrusion 21 is exposedfrom the top surface of the lens placement portion 11 in the foregoingembodiments, the present invention is not limited thereto. Theprotrusion insertion hole 20 may be drilled through only the lowersurface of the lens placement portion 11 so that the tip of theprotrusion 21 may not be exposed from the top surface of the lensplacement portion 11.

The invention claimed is:
 1. An apparatus for use with an intraocularlens that includes an optical portion and first and second supportportions, the apparatus comprising: a tubular member including a lensplacement portion, a nozzle that is configured to be inserted into aneye, a plunger that moves in a lens advancement direction toward thenozzle, and an inner surface defining an internal lumen that extendsfrom the lens placement portion to the nozzle and through which theplunger and the intraocular lens travel in the lens advancementdirection; and means for moving in and out of the internal lumen throughwhich the plunger and the intraocular lens travel and, when in theinternal lumen, contacting and bending the first support portion in adirection opposite the lens advancement direction as the intraocularlens travels though the internal lumen in the lens advancement directionwith the first support portion ahead of the second support portion suchthat the first support portion remains bent when it enters the nozzle.2. An apparatus as claimed in claim 1, wherein the tubular membercomprises a portion of an intraocular lens cartridge.
 3. An apparatus asclaimed in claim 2, wherein the means for moving, contacting and bendingis located on a cartridge case.
 4. An apparatus as claimed in claim 1,wherein the tubular member comprises a portion of an intraocular lensinsertion device.
 5. An apparatus as claimed in claim 4, wherein themeans for moving, contacting and bending is located on an insertiondevice case.
 6. An apparatus for use with an intraocular lens thatincludes an optical portion and first and second support portions, theapparatus comprising: a tubular member including a lens placementportion, a nozzle that is configured to be inserted into an eye, aplunger that moves in a lens advancement direction toward the nozzle,and an inner surface defining an internal lumen that extends from thelens placement portion to the nozzle and through which the plunger andthe intraocular lens travel in the lens advancement direction; and meansfor moving in and out of the internal lumen through which the plungerand the intraocular lens travel at a contact location and, when in theinternal lumen at the contact location, contacting and bending the firstsupport portion in a direction opposite the lens advancement directionas the intraocular lens travels though the internal lumen in the lensadvancement direction with the first support portion ahead of the secondsupport portion such that the first support portion remains bent when itenters the nozzle; wherein the respective configurations of the internallumen and the contact location are such that the intraocular lensoptical portion abuts the means for moving, contacting and bending atthe contact location as the intraocular lens travels though the internallumen in the lens advancement direction.
 7. An apparatus as claimed inclaim 6, wherein the tubular member comprises a portion of anintraocular lens cartridge.
 8. An apparatus as claimed in claim 7,wherein the means for moving, contacting and bending is located on acartridge case.
 9. An apparatus as claimed in claim 6, wherein thetubular member comprises a portion of an intraocular lens insertiondevice.
 10. An apparatus as claimed in claim 9, wherein the means formoving, contacting and bending is located on an insertion device case.